Flash bombs (光玉, hikaridama) are used for diversions, creating a blinding light when they detonate. It may look like small spheres wrapped in paper with the character 'light' (光, hikari) or, more conventionally, as canisters.[1] In the anime, it was shown that flash bombs can also be used in paper form similar to explosive tags.[2]

Trivia

Flash bombs are popular tools of the Nara clan, as they can use them to temporarily increase the size and range of their shadows.